<template>
  <div class="login_container">
   <div class="login_box">
     <!--头像区域-->
     <div class="avatar_box">
       <img src="../assets/logo.png">
     </div>
     <!--登录表单区域---->
     <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
       <!----用户名---->
       <el-form-item prop="username">
         <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
       </el-form-item>
       <!----密码---->
       <el-form-item prop="password">
         <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
       </el-form-item>
       <!------按钮区域----->
       <el-form-item class="btns">
         <el-button type="primary" @click="login">登录</el-button>
         <el-button type="info" @click="resetLoginForm">重置</el-button>
       </el-form-item>
     </el-form>
   </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 这是登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 这是表单的验证规章对象
      loginFormRules: {
      // 验证用户名是否合法
        username: [
          { required: true, message: '请输入正确的用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在3到10个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入正确的密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在6到15个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮，重置登录表单
    resetLoginForm () {
      // console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid)
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.stauts === 200) return this.$message.error('登陆失败！')
        this.$message.success('登陆成功')
        // 1.将登陆成功之后的token，保存到客户端的sessionStorage中
        //   1.1 项目中除了登录之后之外的其他API接口，必须在登录之后才能访问
        //   1.2 token只应在当前网站打开期间生效，所以token保存在sessionStorage中
        console.log(res)

        window.sessionStorage.setItem('token', res.data.token)
        // 2.通过编程式导航跳转到后台主页，路由地址是/home
        console.log('-----------------------')
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container{
  background-color: #2b4b6b;
  height: 100%;
}
  .login_box{
    width: 450px;
    height: 300px;
    background-color: white;
    border-radius:3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
  }
  .avatar_box{
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #ffffff;
    img{
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: white;
    }
  }
  .login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
  .btns{
    display: flex;
    justify-content: flex-end;
  }
</style>
